Imagine an overnight bicycle trip in the northern winter, perhaps on a nondescript snowmobile trail in the woods near your town. Moonlight illuminates a thick powder coat of snow on the trees, so much so that you don’t even need to use a headlight, despite the inky hue of the sky. The squeak of packed snow under your tires indicates the level of cold — probably about 5 degrees F and dropping. But you’re not concerned. You have warm boots, warm mitts, and panniers full of winter camping gear. You’ve been riding hard and working up body heat for several hours, ever since you left work on a nondescript evening in December, to venture into a black-and-white world that few ever see.